package com.zzh.ftp.test;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.RandomAccessFile;

import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;

public class FtpHelper {
    public static FTPClient ftpClient = new FTPClient();
 
    /**
     * 连接到FTP服务器
     *
     * @param hostname
     *            主机名
     * @param port
     *            端口
     * @param username
     *            用户名
     * @param password
     *            密码
     * @return 是否连接成功
     * @throws IOException
     */
    public boolean connect(String hostname, int port, String username,
            String password) throws IOException {
        ftpClient.connect(hostname, port);
        ftpClient.setControlEncoding("GBK"); 
        if (FTPReply.isPositiveCompletion(ftpClient.getReplyCode())) {
            if (ftpClient.login(username, password)) {
                return true;
            }
        }
        disconnect();
        return false;
    }
 
    /**
     * 从FTP服务器上下载文件,支持断点续传，上传百分比汇报
     *
     * @param remote
     *            远程文件路径
     * @param local
     *            本地文件路径
     * @return 上传的状态
     * @throws IOException
     */
    public DownloadStatus download(String remote, String local)
            throws IOException {
        // 设置被动模式
        ftpClient.enterLocalPassiveMode();
        // 设置以二进制方式传输
        ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
        DownloadStatus result;
 
        // 检查远程文件是否存在
        FTPFile[] files = ftpClient.listFiles(new String(
                remote.getBytes("GBK"), "iso-8859-1"));
        if (files.length != 1) {
            System.out.println("远程文件不存在");
            return DownloadStatus.Remote_File_Noexist;
        }
 
        long lRemoteSize = files[0].getSize();
        File f = new File(local);
        // 本地存在文件，进行断点下载
        if (f.exists()) {
            long localSize = f.length();
            // 判断本地文件大小是否大于远程文件大小
            if (localSize >= lRemoteSize) {
                System.out.println("本地文件大于远程文件，下载中止");
                return DownloadStatus.Local_Bigger_Remote;
            }
 
            // 进行断点续传，并记录状态
            FileOutputStream out = new FileOutputStream(f, true);
            ftpClient.setRestartOffset(localSize);
            InputStream in = ftpClient.retrieveFileStream(new String(remote
                    .getBytes("GBK"), "iso-8859-1"));
            byte[] bytes = new byte[1024];
            long step = lRemoteSize / 100;
            long process = localSize / step;
            int c;
            while ((c = in.read(bytes)) != -1) {
                out.write(bytes, 0, c);
                localSize += c;
                long nowProcess = localSize / step;
                if (nowProcess > process) {
                    process = nowProcess;
                    if (process % 10 == 0)
                        System.out.println("下载进度：" + process);
                    // TODO 更新文件下载进度,值存放在process变量中
                }
            }
            in.close();
            out.close();
            boolean isDo = ftpClient.completePendingCommand();
            if (isDo) {
                result = DownloadStatus.Download_From_Break_Success;
            } else {
                result = DownloadStatus.Download_From_Break_Failed;
            }
        } else {
            OutputStream out = new FileOutputStream(f);
            InputStream in = ftpClient.retrieveFileStream(new String(remote
                    .getBytes("GBK"), "iso-8859-1"));
            byte[] bytes = new byte[1024];
            long step = lRemoteSize / 100;
            long process = 0;
            long localSize = 0L;
            int c;
            while ((c = in.read(bytes)) != -1) {
                out.write(bytes, 0, c);
                localSize += c;
                long nowProcess = localSize / step;
                if (nowProcess > process) {
                    process = nowProcess;
                    if (process % 10 == 0)
                        System.out.println("下载进度：" + process);
                    // TODO 更新文件下载进度,值存放在process变量中
                }
            }
            in.close();
            out.close();
            boolean upNewStatus = ftpClient.completePendingCommand();
            if (upNewStatus) {
                result = DownloadStatus.Download_New_Success;
            } else {
                result = DownloadStatus.Download_New_Failed;
            }
        }
        return result;
    }
 
    /**
     * 上传文件到FTP服务器，支持断点续传
     *
     * @param local
     *            本地文件名称，绝对路径
     * @param remote
     *            远程文件路径，使用/home/directory1/subdirectory/file.ext
     *            按照Linux上的路径指定方式，支持多级目录嵌套，支持递归创建不存在的目录结构
     * @return 上传结果
     * @throws IOException
     */
    public UploadStatus upload(String local, String remote) throws IOException {
        // 设置PassiveMode传输
        ftpClient.enterLocalPassiveMode();
        // 设置以二进制流的方式传输
        ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
        ftpClient.setControlEncoding("GBK");
        UploadStatus result;
        // 对远程目录的处理
        String remoteFileName = remote;
        if (remote.contains("/")) {
            remoteFileName = remote.substring(remote.lastIndexOf("/") + 1);
            // 创建服务器远程目录结构，创建失败直接返回
            if (createDirecroty(remote, ftpClient) == UploadStatus.Create_Directory_Fail) {
                return UploadStatus.Create_Directory_Fail;
            }
        }
        //ftpClient.feat();
         
//      System.out.println( ftpClient.getReply());
//      System.out.println( ftpClient.acct(null));
//      System.out.println(ftpClient.getReplyCode());
//      System.out.println(ftpClient.getReplyString());
         
 
        // 检查远程是否存在文件
        FTPFile[] files = ftpClient.listFiles(new String(remoteFileName
                .getBytes("GBK"), "iso-8859-1"));
        if (files.length == 1) {
            long remoteSize = files[0].getSize();
            File f = new File(local);
            long localSize = f.length();
            if (remoteSize == localSize) { // 文件存在
                return UploadStatus.File_Exits;
            } else if (remoteSize > localSize) {
                return UploadStatus.Remote_Bigger_Local;
            }
 
            // 尝试移动文件内读取指针,实现断点续传
            result = uploadFile(remoteFileName, f, ftpClient, remoteSize);
 
            // 如果断点续传没有成功，则删除服务器上文件，重新上传
            if (result == UploadStatus.Upload_From_Break_Failed) {
                if (!ftpClient.deleteFile(remoteFileName)) {
                    return UploadStatus.Delete_Remote_Faild;
                }
                result = uploadFile(remoteFileName, f, ftpClient, 0);
            }
        } else {
            result = uploadFile(remoteFileName, new File(local), ftpClient, 0);
        }
        return result;
    }
 
    /**
     * 断开与远程服务器的连接
     *
     * @throws IOException
     */
    public void disconnect() throws IOException {
        if (ftpClient.isConnected()) {
            ftpClient.disconnect();
        }
    }
 
    /**
     * 递归创建远程服务器目录
     *
     * @param remote
     *            远程服务器文件绝对路径
     * @param ftpClient
     *            FTPClient对象
     * @return 目录创建是否成功
     * @throws IOException
     */
    public UploadStatus createDirecroty(String remote, FTPClient ftpClient)
            throws IOException {
        UploadStatus status = UploadStatus.Create_Directory_Success;
        String directory = remote.substring(0, remote.lastIndexOf("/") + 1);
        if (!directory.equalsIgnoreCase("/")
                && !ftpClient.changeWorkingDirectory(new String(directory
                        .getBytes("GBK"), "iso-8859-1"))) {
            // 如果远程目录不存在，则递归创建远程服务器目录
            int start = 0;
            int end = 0;
            if (directory.startsWith("/")) {
                start = 1;
            } else {
                start = 0;
            }
            end = directory.indexOf("/", start);
            while (true) {
                String subDirectory = new String(remote.substring(start, end)
                        .getBytes("GBK"), "iso-8859-1");
                if (!ftpClient.changeWorkingDirectory(subDirectory)) {
                    if (ftpClient.makeDirectory(subDirectory)) {
                        ftpClient.changeWorkingDirectory(subDirectory);
                    } else {
                        System.out.println("创建目录失败");
                        return UploadStatus.Create_Directory_Fail;
                    }
                }
 
                start = end + 1;
                end = directory.indexOf("/", start);
 
                // 检查所有目录是否创建完毕
                if (end <= start) {
                    break;
                }
            }
        }
        return status;
    }
 
    /**
     * 上传文件到服务器,新上传和断点续传
     *
     * @param remoteFile
     *            远程文件名，在上传之前已经将服务器工作目录做了改变
     * @param localFile
     *            本地文件File句柄，绝对路径
     * @param processStep
     *            需要显示的处理进度步进值
     * @param ftpClient
     *            FTPClient引用
     * @return
     * @throws IOException
     */
    public UploadStatus uploadFile(String remoteFile, File localFile,
            FTPClient ftpClient, long remoteSize) throws IOException {
        UploadStatus status;
        // 显示进度的上传
        long step = localFile.length() / 100;
        long process = 0;
        long localreadbytes = 0L;
        RandomAccessFile raf = new RandomAccessFile(localFile, "r");
        String remote = new String(remoteFile.getBytes("GBK"), "iso-8859-1");
        OutputStream out = ftpClient.appendFileStream(remote);
        if(out==null)
        {
            String message = ftpClient.getReplyString();
            throw new RuntimeException(message);           
        }
        // 断点续传
        if (remoteSize > 0) {
            ftpClient.setRestartOffset(remoteSize);
            process = remoteSize / step;
            raf.seek(remoteSize);
            localreadbytes = remoteSize;
        }
        byte[] bytes = new byte[1024];
        int c;
        while ((c = raf.read(bytes)) != -1) {
            out.write(bytes, 0, c);
            localreadbytes += c;
            if (localreadbytes / step != process) {
                process = localreadbytes / step;
                System.out.println("上传进度:" + process);
                // TODO 汇报上传状态
 
            }
        }
        out.flush();
        raf.close();
        out.close();
        boolean result = ftpClient.completePendingCommand();
        if (remoteSize > 0) {
            status = result ? UploadStatus.Upload_From_Break_Success
                    : UploadStatus.Upload_From_Break_Failed;
        } else {
            status = result ? UploadStatus.Upload_New_File_Success
                    : UploadStatus.Upload_New_File_Failed;
        }
        return status;
    }
 
    /**
     * 获取指定目录下的文件名称列表
     * @author HQQW510_64
     * @param currentDir 需要获取其子目录的当前目录名称
     * @return 返回子目录字符串数组
     */
    public String[] GetFileNames(String currentDir) {
        String[] dirs = null;
        try {
            if(currentDir==null)
            dirs = ftpClient.listNames();
            else
                dirs = ftpClient.listNames(currentDir);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return dirs;
    }
     
    /**
     * 获取指定目录下的文件与目录信息集合
     * @param currentDir 指定的当前目录
     * @return 返回的文件集合
     */
    public FTPFile[] GetDirAndFilesInfo(String currentDir)
    {
        FTPFile[] files=null;
         
        try
        {
            if(currentDir==null)           
                files=ftpClient.listFiles();
            else
                files = ftpClient.listFiles(currentDir);
        }
        catch(IOException ex)
        {
            // TODO Auto-generated catch block
            ex.printStackTrace();          
        }
        return files;
    }
}